Function transformCatch

test/fixtures/snapshot/typescript.js:151720–151740

* @param hasContinuation Whether another `then`, `catch`, or `finally` continuation follows this continuation. * @param continuationArgName The argument name for the continuation that follows this call.

(node, onRejected, transformer, hasContinuation, continuationArgName)

         * @param continuationArgName The argument name for the continuation that follows this call.
         */
        function transformCatch(node, onRejected, transformer, hasContinuation, continuationArgName) {
            if (!onRejected || isNullOrUndefined(transformer, onRejected)) {
                // Ignore this call as it has no effect on the result
                return transformExpression(/* returnContextNode */ node, node.expression.expression, transformer, hasContinuation, continuationArgName);
            }
            var inputArgName = getArgBindingName(onRejected, transformer);
            var possibleNameForVarDecl = getPossibleNameForVarDecl(node, transformer, continuationArgName);
            // Transform the left-hand-side of `.then`/`.catch` into an array of inlined statements. We pass `true` for hasContinuation as `node` is the outer continuation.
            var inlinedLeftHandSide = transformExpression(/*returnContextNode*/ node, node.expression.expression, transformer, /*hasContinuation*/ true, possibleNameForVarDecl);
            if (hasFailed())
                return silentFail(); // shortcut out of more work
            // Transform the callback argument into an array of inlined statements. We pass whether we have an outer continuation here
            // as that indicates whether `return` is valid.
            var inlinedCallback = transformCallbackArgument(onRejected, hasContinuation, possibleNameForVarDecl, inputArgName, node, transformer);
            if (hasFailed())
                return silentFail(); // shortcut out of more work
            var tryBlock = ts.factory.createBlock(inlinedLeftHandSide);
            var catchClause = ts.factory.createCatchClause(inputArgName && ts.getSynthesizedDeepClone(declareSynthBindingName(inputArgName)), ts.factory.createBlock(inlinedCallback));
            var tryStatement = ts.factory.createTryStatement(tryBlock, catchClause, /*finallyBlock*/ undefined);
            return finishCatchOrFinallyTransform(node, transformer, tryStatement, possibleNameForVarDecl, continuationArgName);
        }
        /**
         * @param hasContinuation Whether another `then`, `catch`, or `finally` continuation follows this continuation.
         * @param continuationArgName The argument name for the continuation that follows this call.